func createSink(client *logadmin.Client) error {
	// [START create_log_sink]
	ctx := context.Background()
	_, err := client.CreateSink(ctx, &logadmin.Sink{
		ID:          "severe-errors-to-gcs",
		Destination: "storage.googleapis.com/logsinks-bucket",
		Filter:      "severity >= ERROR",
	})
	// [END create_log_sink]
	return err
}